Machine Learning Engineer / Researcher

  • Tokyo
  • Partial Remote
  • Full-time
  • November 4, 2025
Conditions
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¥8M ~ ¥10M /yr
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Apply from Japan Only
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No relocation to Japan
(No visa sponsorship from overseas)
Requirements
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Language Requirements
Japanese: Business Level
English: Business Level
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Minimum Experience
Mid-level or above

Primary Responsibilities

Research and development projects including

  • Open-sourced LLM models
  • Automatic evaluation methods for entertainment MT
  • Multimodal MT for manga / comics
  • OCR for onomatopoeia on manga / comics
  • ML-based typesetting engine for manga translation

 

Basic Qualifications

  • Master's or Ph.D. in machine learning, or at least 2 years of practical experience in the field.
  • Experience planning and conducting research projects that result in publications in peer-reviewed journals (or equivalent).
  • Experience in training machine learning models and improving task accuracy

 

Preferred Qualifications

  • PhD in CS, EE, or equivalent fields
  • Experience as the first author in top conferences such as ACL, NAACL, EMNLP, CVPR, ICCV, ECCV, AAAI, IJCAI
  • Experience in development with advanced technologies such as LLMs and diffusion models
  • Experience in application development such as web services
  • Japanese language skill (JLPT N2+)

 

The Ideal Candidate

  • Someone accustomed to continuous learning
  • Able to approach problems by formulating and then verifying hypotheses
  • Enjoys communicating with people from different fields and backgrounds
  • Able to take ownership and handle working independently
  • Strong interest in Mantra's focus areas (manga, language, machine learning)

 

Selection process

  • Document screening (resume, detailed career and job history, portfolio)
  • ~3 Interviews
  • Final meeting to discuss terms of employment and compensation

Mantra has been developing machine learning technologies specifically for the entertainment industry.

Mantra's machine translation engine consists of computer vision / natural language processing technologies for manga.

Here are two services that use the technologies:

  • MANTRA ENGINE - A translation support platform for businesses
    Mantra provides a multilingual translation engine developed for manga and webtoon, and is widely used by publishers and distribution services. By integrating most steps of the translation workflow, this unique solution enables simultaneous distribution worldwide.

  • LANGAKU - English learning service with Manga
    Langaku helps learners improve their English by reading Manga. Readers can adjust the language difficulty, access text audio for listening practice, and read in multiple languages, making learning easier and more fun. Langaku brings the joy of Manga to English language learners.
View Mantra's company page

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Machine Learning Engineer / Researcher at Mantra
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